Definition of enzyme noun from the Oxford Advanced Learner's Dictionary

 

enzyme

 noun
noun
BrE BrE//ˈenzaɪm//
 
; NAmE NAmE//ˈenzaɪm//
 
(biology) Cell biology
 
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a substance, produced by all living things, which helps a chemical change happen or happen more quickly, without being changed itself Enzymes are essential to the body’s functioning. see also protein See related entries: Cell biology Word Origin late 19th cent.: coined in German from modern Greek enzumos ‘leavened’, from en- ‘within’ + Greek zumē ‘leaven’.
See the Oxford Advanced American Dictionary entry: enzyme